package com.xzh.gulimall.ware.service.impl;

import com.alibaba.fastjson.TypeReference;
import com.rabbitmq.client.AMQP;
import com.rabbitmq.client.Channel;
import com.xzh.common.to.mq.OrderTo;
import com.xzh.common.to.mq.StockDetailTo;
import com.xzh.common.to.mq.StockLockedTo;
import com.xzh.common.utils.R;
import com.xzh.gulimall.ware.entity.WareOrderTaskDetailEntity;
import com.xzh.gulimall.ware.entity.WareOrderTaskEntity;
import com.xzh.gulimall.ware.exception.NoStockException;
import com.xzh.gulimall.ware.feign.OrderFeignService;
import com.xzh.gulimall.ware.feign.ProductFeignService;
import com.xzh.gulimall.ware.service.WareOrderTaskDetailService;
import com.xzh.gulimall.ware.service.WareOrderTaskService;
import com.xzh.gulimall.ware.vo.*;
import jdk.nashorn.internal.runtime.options.OptionTemplate;
import lombok.Data;
import org.apache.commons.lang.StringUtils;
import org.springframework.amqp.core.Message;
import org.springframework.amqp.rabbit.annotation.RabbitHandler;
import org.springframework.amqp.rabbit.annotation.RabbitListener;
import org.springframework.amqp.rabbit.core.RabbitTemplate;
import org.springframework.aop.framework.AopContext;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.io.IOException;
import java.util.List;
import java.util.Map;
import java.util.stream.Collectors;

import com.baomidou.mybatisplus.core.conditions.query.QueryWrapper;
import com.baomidou.mybatisplus.core.metadata.IPage;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.xzh.common.utils.PageUtils;
import com.xzh.common.utils.Query;

import com.xzh.gulimall.ware.dao.WareSkuDao;
import com.xzh.gulimall.ware.entity.WareSkuEntity;
import com.xzh.gulimall.ware.service.WareSkuService;
import org.springframework.transaction.annotation.Propagation;
import org.springframework.transaction.annotation.Transactional;


@Service("wareSkuService")
public class WareSkuServiceImpl extends ServiceImpl<WareSkuDao, WareSkuEntity> implements WareSkuService {

    @Autowired
    WareSkuDao wareSkuDao;
    @Autowired
    ProductFeignService productFeignService;
    @Autowired
    RabbitTemplate rabbitTemplate;
    @Autowired
    WareOrderTaskDetailService orderTaskDetailService;
    @Autowired
    WareOrderTaskService orderTaskService;
    @Autowired
    OrderFeignService orderFeignService;




    private void unLockStock(Long skuId,Long wareId,Integer num,Long taskDetailId)
    {
        //库存解锁
        wareSkuDao.unLockStock(skuId,wareId,num);
        //更新库存工作单
        WareOrderTaskDetailEntity entity = new WareOrderTaskDetailEntity();
        entity.setId(taskDetailId);
        entity.setLockStatus(2);//变为已解锁
        orderTaskDetailService.updateById(entity);

    }



    @Override
    public PageUtils queryPage(Map<String, Object> params) {
        QueryWrapper<WareSkuEntity> wrapper = new QueryWrapper<>();
        String skuId = (String) params.get("skuId");
        if(!StringUtils.isEmpty(skuId)){
            wrapper.eq("sku_id",skuId);
        }
        String watrId = (String) params.get("wareId");
        if(!StringUtils.isEmpty(watrId)){
            wrapper.eq("ware_id",watrId);
        }
        IPage<WareSkuEntity> page = this.page(
                new Query<WareSkuEntity>().getPage(params),
                wrapper
        );

        return new PageUtils(page);
    }

    @Override
    public void addStock(Long skuId, Long wareId, Integer skuNum) {

        List<WareSkuEntity> entities = this.baseMapper.selectList(new QueryWrapper<WareSkuEntity>().eq("sku_id", skuId)
                .eq("ware_id", wareId));
        //判断如果还没有这个库存记录则新增
        if(entities==null||entities.size()==0){
            WareSkuEntity skuEntity = new WareSkuEntity();
            skuEntity.setSkuId(skuId);
            skuEntity.setStock(skuNum);
            skuEntity.setWareId(wareId);
            skuEntity.setStockLocked(0);
            //远程查询sku名字，如果失败，整个事务不需要回滚
            try {
                R info = productFeignService.info(skuId);
                Map<String,Object> data = (Map<String, Object>) info.get("skuInfo");
                if(info.getCode()==0){
                    skuEntity.setSkuName((String) data.get("skuName"));
                }

            }catch (Exception e){

            }

            this.baseMapper.insert(skuEntity);
        }else {
            this.baseMapper.addStock(skuId,wareId,skuNum);
        }

    }

    @Override
    public List<SkuHasStockVo> getSkuHasStock(List<Long> skuIds) {
        List<SkuHasStockVo> collect = skuIds.stream().map(skuId -> {
            SkuHasStockVo vo = new SkuHasStockVo();

            //查询当前sku的总库存量
            Long count = baseMapper.getSkuStock(skuId);
            vo.setSkuId(skuId);
            vo.setHasStock(count==null?false:count>0);
            return vo;
        }).collect(Collectors.toList());
        return collect;
    }

    //为某个订单锁定库存
    /*
    默认只要是运行时异常都会回滚

    库存解锁的场景
    1）下订单成功、订单过期没有支付被系统取消、被用户手动取消。都要解锁库存
    2）下订单成功，库存锁定成功，但是接下来的业务调用失败导致订单回滚，之前锁定的库存就要自动解锁
    * */
    @Transactional(rollbackFor = Exception.class)
    @Override
    public Boolean orderLockStock(WareSkuLockVo vo) {
        /*保存库存工作单的详情
        * 追溯*/
        WareOrderTaskEntity taskEntity = new WareOrderTaskEntity();
        taskEntity.setOrderSn(vo.getOrderSn());

        orderTaskService.save(taskEntity);

        //1、按照下单的收货地址，找到就近仓库，锁定库存

        //找到每个商品在哪个仓库有库存
        List<OrderItemVo> locks = vo.getLocks();
        List<SkuWareHasStock> collect = locks.stream().map(item -> {
            SkuWareHasStock stock = new SkuWareHasStock();
            Long skuId = item.getSkuId();
            stock.setSkuId(skuId);
            stock.setNum(item.getCount());
            //查询这个商品在哪里有库存
            List<Long> wareId = wareSkuDao.listWareIdhasSkuStock(skuId);
            stock.setWareId(wareId);
            return stock;
        }).collect(Collectors.toList());
        Boolean allLocked = true;
        //锁定库存
        for (SkuWareHasStock hasStock : collect) {
            Boolean skuStocked = false;
            Long skuId = hasStock.getSkuId();
            List<Long> wareIds = hasStock.getWareId();
            if(wareIds==null&&wareIds.size()==0){
                //没有任何仓库有这个商品的库存
                throw new NoStockException(skuId);
            }
            //如果每一个商品都锁定成功，将当前商品锁定了几件的工作单记录发送给mq
            //如果锁定失败，前面保存的工作单信息就会滚了，发送出去的消息，即使要检索记录，由于去数据库查不到id，所以就不用解锁

            for (Long wareId : wareIds) {
                //成功就返回1，否则就是0
                Long count = wareSkuDao.lockSkuStock(skuId,wareId,hasStock.getNum());
                if(count == 1){
                    skuStocked = true;
                    //TODO:发送消息告诉mq锁定成功
                    WareOrderTaskDetailEntity entity = new WareOrderTaskDetailEntity(null,skuId,"", hasStock.getNum(), taskEntity.getId(), wareId,1);
                    orderTaskDetailService.save(entity);
                    StockLockedTo lockedTo = new StockLockedTo();
                    lockedTo.setId(taskEntity.getId());
                    StockDetailTo stockDetailTo = new StockDetailTo();
                    BeanUtils.copyProperties(entity,stockDetailTo);
                    lockedTo.setDetail(stockDetailTo);
                    rabbitTemplate.convertAndSend("stock-event-exchange","stock.locked",lockedTo);
                    break;
                }else{
                    //当前仓库锁失败，重试锁下一个
                }
            }
            if(skuStocked==false){
                //当前商品所有仓库都没有锁住
                throw new NoStockException(skuId);
            }
        }
        //肯定全部都是锁定成功的
        return true;
    }

    @Override
    public void unlockStock(StockLockedTo to) {

        StockDetailTo detail = to.getDetail();
        Long detailId = detail.getId();
        //解锁
        //查询数据库关于订单的锁定库存信息
        //有，证明库存锁定成功了
        //    1、没有这个订单，必须解锁
        //    2、有这个订单，不是解锁库存
        //订单状态 ，已取消，解锁库存
        //没取消  不解锁
        WareOrderTaskDetailEntity byId = orderTaskDetailService.getById(detailId);
        if (byId != null) {
            //解锁
            Long id = to.getId();//库存工作单的id
            WareOrderTaskEntity taskEntity = orderTaskService.getById(id);
            String orderSn = taskEntity.getOrderSn(); //根据订单号查询订单状态
            R r = orderFeignService.getOrderStatus(orderSn);
            System.out.println(r);
            if (r.getCode() == 0) {
                //订单数据返回成功
                OrderVo data = r.getData(new TypeReference<OrderVo>() {
                });

                if (data == null || data.getStatus() == 4) {
                    //订单不存在或者订单已经被取消了，解锁库存
                    if(byId.getLockStatus()==1){
                        //当前库存工作单详情，状态为1表示已锁定但是未解锁才可以解锁
                        unLockStock(detail.getSkuId(), detail.getWareId(), detail.getSkuNum(), detail.getTaskId());
                    }
                }
            } else {
                //消息拒绝以后重新放到队列里，让别人继续消费解锁
                throw new RuntimeException("远程服务失败");
            }
        } else {
            //没有，意味着库存锁定失败了，库存回滚了，这种情况下无需解锁

        }

    }

    //防止订单服务卡顿导致消息一致改不了，库存消息优先到期，查询订单状态是新建状态，什么都不做
    //导致卡顿的订单永远无法解锁库存
    @Transactional
    @Override
    public void unlockStock(OrderTo orderTo) {
        String orderSn = orderTo.getOrderSn();
        //查一下库存最新的解锁状态，防止重复解锁库存
        WareOrderTaskEntity task = orderTaskService.getOrderTaskByOrderSn(orderSn);
        Long id = task.getId();
        //按照工作单找到所有没有解锁的
        List<WareOrderTaskDetailEntity> entities = orderTaskDetailService.list(
                new QueryWrapper<WareOrderTaskDetailEntity>().
                        eq("task_id", id).
                        eq("lock_status", 1));
        for (WareOrderTaskDetailEntity entity : entities) {
            unLockStock(entity.getSkuId(),entity.getWareId(),entity.getSkuNum(),entity.getId());
        }
    }


    @Data
    class SkuWareHasStock{
        private Long skuId;
        private Integer num;
        private List<Long> wareId;
    }

}